Getting Stuck on Bench Press

I'm 19, weight 195, 5'10" tall, and bench around 315. When I'm benchpressing, I always get stuck when the bar is about 2-3 inches from my chest. I usually need a spotter to help me at this point, but after I get it above that 2-3 inch range, I can get the weight totally by myself. I usually get stuck like this on the last two reps of my set. Is it my chest, triceps, shoulders, back, or something else? Any help would be appreciated.

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